Reading the article about seizures:
Seizures can cause involuntary changes in body movement or function, sensation, awareness, or behavior. A seizure can last from a few seconds to status epilepticus, a continuous seizure that will not stop without intervention. Seizure is often associated with a sudden and involuntary contraction of a group of muscles. However, a seizure can also be as subtle as marching numbness of a part of the body, a brief loss of memory, sparkling or flashes, sensing an unpleasant odor, a strange epigastric sensation or a sensation of fear. Therefore seizures are typically classified as motor, sensory, autonomic, emotional or cognitive.
So it looks like a kind of a seizure - I'd say electrically overloaded part of the brain. I do lose ability to speak normally and full awareness during the flash. These are probably caused by MS (look at the possible causes of seizures - one of them is MS).
Now I'd really have to find the cause for my
MS because it's causing me more and more troubles. Sound like a simple task but... Where should I start?